1 Department of Internal Medicine, Dell Medical School at the University of Texas at Austin, Austin, TX, USA.
2 Costs of Care, Boston, MA, USA.
3 Division of General Internal Medicine and Health Services Research, David Geffen School of Medicine at the University of California, Los Angeles, CA, USA.
4 Center for the Study of Healthcare Innovation, Implementation & Policy, Greater Los Angeles VA Healthcare System, Los Angeles, CA, USA.